Base Difficulty

Base difficulty: Level 6 edit

Level distribution for noun (time_period): 6: 4 22: 25 220: 15 405: 3 1030: 2 1050: 1 1070: 1 1120: 4 1200: 1 1202: 2

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1299 for level
Frequency and Tier Signals
Combined Frequency Rank: — (run python -m storage.admin --calc-ranks to populate)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr A1 (1 of 6) 800

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 1017.85 138 100% 119 2
20th_books 1176.48 121 100% 107 2
wiki_math 39.55 2326 100% 2326 1
wiki_geography 328.62 466 100% 361 2
wiki_biology 517.43 291 100% 226 2
wiki_modern_life 356.11 365 100% 322 2
wiki_arts 707.22 166 100% 147 2
wiki_society 894.17 116 100% 104 2
wiki_linguistics 160.56 889 100% 728 2
wiki_physical_science 788.15 143 100% 130 2
wiki_history 1052.04 94 100% 88 2
early_modern_science 658.65 172 100% 158 2
religious_translated 1641.66 88 100% 74 2
cooking 74.78 1378 100% 1378 1
legal_scotus 387.86 337 100% 305 2
eu_parliament_debates 359.43 504 100% 339 2
openstax_science 741.68 153 100% 140 2
openstax_society 1249.44 110 100% 86 2
wpa_life_histories 1028.89 156 100% 118 2

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.